Dear Jerry

If you give more of the specific information about the problem you are trying to solve, there are several contributors to this forum who will gladly offer to give you their experience, sizing guidelines and Excel calculation methods, and even provide you with their specific recommendations.

They will need to know the material you want to handle, it's physical characterisitcs, the capacity of the system, the distance you want to convey, both vertical as well as horizontal, the number of bends in the system, the elevation of the location where the system will be installed, etc.

Regards ■

Dear Jerry

The density you give, is that bulk density or material density ?

I assumed that it is bulk density.

The material density must then be around 8000 kg/m3 or even heavier

What kind of material is that ? Steel perhaps ?

Based on 8000 kg/m3 and a particle size of 0,8 mm average, the floating velocity should be around 11 m/sec

The air velocity in the pipelines should then be around 50 m/sec at atmospheric conditions.

This resulted in the following calculation

This calculation is far from accurate, but it shows in what direction the installation would look like.

FORUM zz d 11-20-2005

Pressure discharge ????????

Convey length = 190 m

Nu of bends= 9

Pump vol = 2.5 + 2.5 m^3/s

q-convey = 2.50 m^3/s

Dia begin = 193 mm

Dia end = 243 mm

Kettle volume = 50.0 m^3

Cement vol.= 40.0 m^3

C-Vessel = 500 tons/hr

Kettle Cement content = 200.0 tons

Pipevolume = 6.24 m^3

Pipeline Syst. /Nr of Req.kettle

Press. Cap. mu Cap. /kettles fact. v-begin v-end kWh/ton res.time

2.000 - 84 - 7 - 83 / 0.4 - 252 - 29.3 - 52.7 - 5.28 - 8.88

1.750 - 67 - 6 - 67 / 0.3 - 185 - 32.0 - 52.6 - 5.87 - 8.48

1.500 - 50 - 5 - 50 / 0.2 - 126 - 35.2 - 52.6 - 6.89 - 8.11

1.250 - 33 - 3 - 33 / 0.1 - 74 - 39.1 - 52.6 - 9.13 - 7.79

1.000 - 13 - 1 - 13 / 0.0 - 26 - 44.0 - 52.5 - 19.56 - 7.57

Maximum system capacity : 83 t/hr at 2 bar(o)

First of all, it seems technically feasible to convey this material.

(Floating velocity is comparable to that of soybeans or grains)

The loading ratio which can be applied is around 7, which is very low.

Therefore the energy consumption per ton is very high.

As I assumed a certain product loss resistance factor, this calculation is (again) far from accurate.

If f.i. this is a very friable product, this resistance factor could be much higher,

because a lot on energy would then be spent on breaking the particles. (inelastic collisions)

Also the abrasiveness of the product is unknown, with the same influence on product resistance factor.

Mentioning your product would make it perhaps easier to determine whether it is possible to convey your material, because then there might emerge practical experience from the forum members.

best regards ■

Hi Dear Teus Tuinenburg,

My Name is majid.abdi and happy for meet you in weblog.I have 26 years old.

My work is design of vacuum cleaner machines.

I need a software (application file orexcel) for calculate of an example of dilute vacuum conveying material.

If you help me, I can have progress in my job.

My email address is : (majid.m.abdi1987@gmail.com)

Thank you very much. ■

Originally Posted by Jerryliu

Dear sirs

I am just working on the penumatic conveying syterm caculation. I only learn a little bit dilute phase penumatic conveying system.

I request the kindly help on the design work.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

I think you are requesting a PDF copy of my article "THEORY AND DESIGN OF DILUTE PHASE PNEUMATIC CONVEYING SYSTEMS". Please confirm your request. I will be glad to send its copy to you.

Amrit Agarwal

Pneumatic Conveying Consulting

Email: polypcc@aol.com ■